Dan Newberry sleuthed the 308 175 SMK FGMM Ammo several years ago. I have no idea what the powder is today but according to his YT video(posted below) it is 4064. Posting results for 8 shots.
Top left is cold bore. Shot 6 bottom right, the rifle was in a bit of a bind and the shot was made without reestablishing rifle position or grip. Not making excuses but pointing out the potential of reloaded FC FGMM brass weighed within .5 grains before prep, FGMM 210M primers, and 41.75 + .02 grains of IMR 4064 seated to 2.820. There was no load workup. Shot in a 28" Criterion 10 TW heavy barrel with at least 2500 rounds, Choate stock and tuned Accutrigger with a F/class sinclair bipod. Just load and shoot.
If you take out the cold bore and the pulled shot there are 6 shots in the neighborhood of 5/16". If you are looking for a load that will shoot in your 308 without having to do a load workup this maybe what you are looking for. It requires you to get close and stay consistent with your charge weights.
Dan Newberry's video.
https://www.youtube.com/watch?v=iDIu6Mivi-Y
Originally Posted by Robinhood
Dan Newberry sleuthed the 308 175 SMK FGMM Ammo several years ago. I have no idea what the powder is today but according to his YT video(posted below) it is 4064. Posting results for 8 shots.
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